<!DOCTYPE html>
<html lang='en'>
<head>
    <meta charset='UTF-8'>
    <title>下文规则 3 - 2</title>
</head>
<body>
    <script>
        function fun() {
            arguments[3]();  // 'b'；数组中枚举出函数进行调用，适用规则 3
        }
        fun('a', 'b', 'c', function () {
            console.log(this[1]);
        });
    </script>
</body>
</html>
